// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/url_request/file_protocol_handler.h"

#include "base/logging.h"
#include "base/task_runner.h"
#include "net/base/filename_util.h"
#include "net/base/net_errors.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_error_job.h"
#include "net/url_request/url_request_file_dir_job.h"
#include "net/url_request/url_request_file_job.h"

namespace net {

FileProtocolHandler::FileProtocolHandler(
    const scoped_refptr<base::TaskRunner>& file_task_runner)
    : file_task_runner_(file_task_runner)
{
}

FileProtocolHandler::~FileProtocolHandler() { }

URLRequestJob* FileProtocolHandler::MaybeCreateJob(
    URLRequest* request, NetworkDelegate* network_delegate) const
{
    base::FilePath file_path;
    const bool is_file = FileURLToFilePath(request->url(), &file_path);

    // Check file access permissions.
    if (!network_delegate || !network_delegate->CanAccessFile(*request, file_path)) {
        return new URLRequestErrorJob(request, network_delegate, ERR_ACCESS_DENIED);
    }

    // We need to decide whether to create URLRequestFileJob for file access or
    // URLRequestFileDirJob for directory access. To avoid accessing the
    // filesystem, we only look at the path string here.
    // The code in the URLRequestFileJob::Start() method discovers that a path,
    // which doesn't end with a slash, should really be treated as a directory,
    // and it then redirects to the URLRequestFileDirJob.
    if (is_file && file_path.EndsWithSeparator() && file_path.IsAbsolute()) {
        return new URLRequestFileDirJob(request, network_delegate, file_path);
    }

    // Use a regular file request job for all non-directories (including invalid
    // file names).
    return new URLRequestFileJob(request, network_delegate, file_path,
        file_task_runner_);
}

bool FileProtocolHandler::IsSafeRedirectTarget(const GURL& location) const
{
    return false;
}

} // namespace net
